Printing control mechanism for typewriter-computers



Aug. 24, 1954 J. TOGGENBURGER 2,637,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Original Filed Dec. 21. 1948 14 Sheets-Sheet l INVENTOR. JOHN TOGGENBURGER ATTURNEY Aug. 24, 1954 J. TOGGENBURGER PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Original Filed Dec. 21, 1948 14 Sheets-Sheet 2 BY N IN V5 T03, OHN TOQSENSUFPGER A TTORNEY Aug. 24, 1954 J. TOGGENBURGER 2,537,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Ori inal Filed Dec. 21, 1948 14 Sheets-Sheet I5 v IN V EN TOR. JOHN TOGGENBURGER ATTORNE Y Aug. 24, 1954 J. TOGGENBURGER PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS 14 Sheet s-Sheet 4 Original Filed Dec. 21, 1948 mm y flnww 5m mu Q mg i 2 F: :W x Ea m CECUEfihZE m T E M CECE Tz z z zfi Q3 Q w m g- 1954 J. TOGGENBURGER 2,687,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS l4 Sheets-Sheet 6 Original Filed Dec. 21, 1948 I |lmn'\ lumuunu llllllllllllx lllrq i 476 0 466 m.

I NVENTOR. JOHN TOGGENBURGER ATTORNEY Aug. 24, 1954 J. TOGGENBURGER 2,687,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Original Filed Dec. 21, 1948 14 Sheets-Sheet 7 I A w v g I Aug. 24, 1954 ,1. TOGGENBURGER PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS 14 Sheets-Sheet 8 Original Filed Dec. 21, 1948 JNVENTOR.

OHN TOGGENBURGER 1954 J. TOGGENBURGER 2,687,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Original Filed Dec. 21, 1948 14 Sheets-Sheet 9 2 MI 49 W Fw if g J z7\ 27 INVENTOR.

JOHN TOGGE/VBURGER "/65 i 53 /37 BY I I i M2 51 r @514; a

A TTORWEY Aug. 24, 1954 J. TOGGENBURGER 2,637,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Original Filed Dec. 21, 1948 14 Sheets-Sheet 10 I NV EN TOR. JOHN TOGGE/VBURGEP BY www ATTCRNEY Aug. 24, 1954 J. TOGGENBURGER 2,537,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS WON 9% ATTORNEY INVENT JOHN TOGGENB PGER 1954 J. TOGGENBURGER 2,687,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Original Filed Dec. 21, 1948 14 Sheets-Sheet l2 L72 L. .2: m 2112 3?? fi i INVENTOR. JOHN TO GGENBUPGER A TTORNEY Aug. 24, 1954 J. 'IOGGENBURGER 2,637,251

PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS Original Filed Dec. 21, 1948 14 Sheets-Sheet l3 um 1! I2 1? 67/ 50 5/ I v 93 i- JOHN TOGGE NBC/RG5 Patented Aug. 24, 1954 PRINTING CONTROL MECHANISM FOR TYPEWRITER-COMPUTERS John Toggenburger, Hartford, Conn, assignor to Underwood Corporation, New York, N. Y., a corporation of Delaware Original application December 21, 1948, Serial Divided and this application No vember 2, 1951, Serial No. 254,485

16 Claims. 1 This invention is a division of a previously filed application, Serial No. 66,441, filed December 21, 1948. Said previously filed application is directed to features involving adding and computing Also an object of the invention is to operate differentially'printing members, such as adding machine printing members, under maintenance of considerable clearance from the front of a mechanism, including amount recording means, 5 platen, then to move collectively such printing in combination with typewriting facilities, wheremembers nearly or lightly into contact with the as the invention featured herein is not necessarily platen, and thereafter to press the types seriatim used in conjunction with typewriting facilities, againstthe platen for quiet and 'efficient printing. but pertains generally to any machine wherein a -It is a further object'of the invention to proplurality of character imprints are efiected by a v d in association With adding put series of adjacent, difierentially positionable chine prin i b efficient means t v in y printing bars, for example such as are used in printing cycle those printing bars below a printadding and computing machines. some features ing level which are to the left or the leftmost of the invention are directed additionally to addone thathas become differentially actuated above ing machine and computing machine features. e o positio in other Words, to lower the printing It is therefore one object of the-instant invenbars which are not'required to be active n p tion to provide an improved printing mechanism g an amount. of the kind embodying a series of difierentially elsoennbjeet 0f the invention to p d positionable printing bars as are used in adding fie ent means to w r in all printing y and computing 1nachines below zero printing position, those printing mem- A more specific object of the invention is to bers which are to the left of the leftmost one provide efficient pressure printing facilities for Which s rising to a Significant digit peeitien, and machines embodying a series of adjacent print- QW in total printing y eswherein the total m bars printed -is zero, less than all printing members Also-an object or" the invention is to provide below zero position, w by to C use in total efficient means to eiiect pressure imprints seriap t Operations the printing of t g fiea tim from a series of printing bars which are selecdigits v(if the total, and in case the total is Zero, tively positionable for character selection. the printing o e Zeros- It is a further object to effect imprints quietly, t is an o j t a s t r vi reliably r in an efficient manner, by mechanism pressing tiVe, elfieient, key-responsive D W de H d ti t seleated types against, a t vices for setting up the numerical values of the whereby the platen is subjected to a minimum Computing m ha ism of the machine. of bending stress, A further object is to provide efficient carriage An important object of the invention is to procontrol means whereby mac e Cycles Wi nm for imprints off differentially adjustable stitute automatically columnar tabulating movejacent, printing members by roping means merits-of the carriage but'only if the carriage has ing across the front of such printing members to moved to particular columnar positions. press them seriatim under high leverage condition A Still further object is to pr v in j and with a minimum of noise and shock into tion i a column u i s mechanism caprinting contact with record material. Fable of actuation by the machine yc mech- A further Object of the inventionis t provide 40 anism, a carriage controlled mechanism to disprinting bars or members which have the digit able the tabulating mechanism whenever the cartypes spewed therealong sufficiently far apart to riage moves to a certain columnar position. assure separate distinct digit imprints against the The noted Objects are eive of only some record material, to provide additionally register f the y features of the nvention and addiactuators related with said printing bars and havt i nhi will readily be perceived from the ing smaller operating strokes than said printing die-summon ht 'tf P f bars, thereby to facilitate use'of small-diameter 1 The machme of h mventlon embodles to registers, and additionally to provide efficient mo- 'it define mechamsm 9 the standard n tion increasing connections between S M d s land ass c accounting machine, as generally exemplified 1n the patent to Sundstrand No.

actuators and said printing bars, preferably ar- 2 194 270 dated March 19 1940 In 1 a 1 l regaidtothc ranged to allow the latter, alter digital pOSltlOIltypewritmg mechanism, use has been made of mg, to be actuated efficiently about the locations much of the mechanismcontained inthe Underof 'the-gear'connectlons agamst the record wood All Electric typewriter recently placed on terial. the market.

Turning now to the drawings:

Figures 1 and 1A, matched together along the vertical dot and dash lines in each of these figures constitute a sectional, left-hand side elevation of applicants composite typewriting and printing computin machine,

Figure 2 is a sectionally front elevation showing a typewriter segment with an upwardly projecting type guide and a set of computing machine printing bars located adjacently to the type guide,

Figure 3 is a plan view, showing the keyboard of applicants composite machine, and showing additionally a mechanism for pressing addin machine type. bars seriatim against a platen and thereby efiecting imprints,

Figure 4 is a fragmentary front view showing some of the keys seen in Figure 3, and particularly a set of digit keys and some control keys, together with operative control trains leadin therefrom,

Figure 5 is a fragmentary left-hand side elevation, depictin the imprint effecting mechanism shown in Figure 3, and additionally a mechanism whereby imprints will be restricted to printing bars of significant orders. The view additionally shows a mechanism whereby the imprint effecting mechanism is controlled to operate only if at least one printing bar rises to a significant position,

Figure 6 is a fragmentary front elevation showing some of the mechanism also seen in Figure 5,

Figure 7 is a perspective view from the right front side of the machine looking down upon cycle instituting and related mechanism,

Figure 8 is a plan view of the imprint effecting device seen in Figure 3, in a position of readiness for action upon the adding machine printing bars,

Figure 9 is similar to Figure 8, but shows the imprint effecting device in an intermediary stage of action,

Figure 10 is similar to Figures 8 and 9, but the imprint effecting device has done its work and is about to return to normal position,

Figure .11 is a sectional front view of portions of a mechanism for rendering the digit keys p0- tentially operative either with respect to the typing or with respect to an amount set-up or indexing mechanism,

Figure 12 is a left-hand side elevation showing the mechanism of Figure 11, and includin a manually settable controlling device set for the digit keys to serve in amount indexing capacity.

Figure 13 is a left-hand sectional view depicting a mechanism to move the printing bars collectively nearer to the platen preparatory to the imprint effecting means comin into action,

Figure 14 shows the manual control device of Figure 12 set so that the digit keys are in control of the typewriting instrumentalities.

Figure 15 is a fragmentary right-hand side elevation depicting certain function control keys and showing also a blank-cycle enforcing mechanism,

Figure 16 is a sectional front elevation taken substantially along lines l6l 6 of Figure 1A, and showing a carriage tabulating mechanism in a normal condition in which the carriage is under control of a letter-feed escapement,

Figure 1'7 is a View similar to Figure 16, but the carriage tabulatin mechanism has been operated and the carriage is in the proces of outing a tabulating movement,

Figure 18 is a frontal, fragmentary sectional trolling with respect to the adding machine indexing mechanism,

Figure 19 is a diagrammatic right-hand sectional representation of the framework supporting the typewriting and the addingmachine instrumentalities,

Figure 20 is a front sectional View similar to Figure 1'7, but with the tabulating mechanism ready to assume normal condition at the end of the tabulating run,

Figure 21 is a representation of a work-sheet together with a, diagrammatic representation of a set of control dogs therefor,

Figure 22 (on sheet with Figure 1) is a plan view of a conventional machine cycling drive, and

Figure 23 is a fractional side elevation of a mechanism to incapacitate the function selectors of the machine.

The description of the invention hereinafter following is divided under the following headings:

1. Work-Sheet Supporting Carriage Typewriting Mechanism and Adding Machine Printing Bars 3. Letter-Feed Mechanism for Work-Sheet Supporting Carriage 4. Computing Mechanism and Printing Means Controlled Thereby Crossfooter and Operatin Means Therefor Rear Registers Machine Cycling Means Cycle Key Cycle and Other Function Controls by Carriage and Keys Carriage Tabulating and Returning Mechanism Automatic Control Means To Condition Digit Keys for Typewriting or Amount Indexing Manual Control To Condition Digit Keys for Typewriting or Amount Indexing Incapacitation of Function Control Selectors for Typewriting Imprint Eifecting Means for Computing Machine Printing Bars Means To Provide for Imprints of Significant Order Only Zero Total Signified by Printing of Two Zeros Means To Prevent Idle Operation of Imprint Eifeoting Means More on Function Control Keys Blank Cycle Enforcing Means Other Control Keys Main Assembly Units Work Example Conclusion 1. Work-sheet supporting carriage Referring now more particularly to Figures 1 and 1A, there is shown a work-sheet supporting carriage it having turnably mounted therein between two carriage ends 12, a paper-supporting platen l l. The carriage comprises also front and rear guideways respectively numbered 13 and M, such ways connecting the two carriage ends l2 rigidly. To facilitate lively letter-feeding movement, the carriage is largely built oflight-weight materials. Cooperative with two guideways I3 and It to the end of guiding the carriage by the intermediary of anti-friction elements I 5, there is provided a stationary rail structure l6. 2. Typewriting mechanism and addin machine printing bars The carriage ill with its platen I l is common to a set of typewriter type bars I1 and a group of adding machine printing bars 18 and 18a, the

*bars 13 being digit printing bars and a bar I811 having signal types. The typewriter type bars I! are pivotally mounted upon a segment to print at a common typewriting point I9 that is situated above a type guide 2|. The addin machine printing bars l8 and IBaarenormally retired below the said typewriting point and are as a group preferably directly adjacent to the left of the type guide, see Figures 2 and 3. The type bar segment 28 is generally of conventional design, but occupies a position sufiiciently forward of the platen to afford operating space for the printing bars 18 which are directlyin back of the segment and normally somewhat in front of the platen, the segment 20 having preferably a clearance cut as at 22 for accommodating it as closely as possible to'the platen. Since the segment has a more forward position than is customary in conventional typewriters, typing heads 23 on the type bars are correspondingly carried thereon in more projecting relations of approach towards the platen. All type bars have at their heads a lip 24 for guiding entrance in the type guide 2| as each type bar approaches its printing position. The type guide 21 is very close to the front of the platen H and is secured to the rear of the type bar segment 20, as at 25. The guiding lips 24 in cooperation with the type guide 2| assure that the-typing impressions are made at the exact location of the typewriting point [9.

The adding machine printing members [8 are confined as a group between the left side of the type guide 2| and a guide element 21 reaching upwardly from the segment 20, see Figures 2 and 3.

The various type bars I! are uided in slots 31 of the segment 20 which converge directly below the type guide 2| The various type heads 23 and their guiding lips 24 approach the platen in upright relation, as is conventional in typewriters. A type bar in typing position is indicated in dot and dash lines, in Figure 2.

The operating mechanism for the typewriter type bars l'i will now be described, and it is to be observed that in the main this mechanism is like that disclosed in the patent to Yaeger, No. 2,254,764, dated September 2, 1941.

In the swinging plane of each type bar I 1 lies a bell crank 32 which by a push link 33 has an operative connection with the type bar. All said bell crank 32, and all said links 33, are identical. The bell cranks 32 are pivotally supported in an arcuate bar 34 which for the purpose has radial guide slots and which carries an arcuate pivot wire 35 common to all the bell cranks. Forwardly of the bell cranks 32 there is pivoted on a straight fulcrum wire 36, a set of upright levers 37, individually swingable forwardly and each connected by a link 33 to an upreaching arm of one of the bell cranks 32. The upright levers 31 are of graded lengths, exactly as in the said patent to Yaeger, No. 2,254,764, and have each a rolling face 40. A pendant lever 4| lies directly to the rear of each rolling face for rolling contact therewith. The arms 41 are pivotally carried on a bar 42, in a straight row and have each pivotally connected thereto, in a rearwardly reaching relation, a type action driving link or actuator 43. The rear of each actuator 43 is urged upwardly and rearwardly by a spring 44, against the bottom of an angle bar 45, so that a snatch pawl 46 thereon is normally clear of a constantly rotating toothed power shaft 41, the latter being common to all 6 the snatch pawls. The actuators 43 and the snatch pawls lie in a row extendin parallel to the power shaft 41.

The said snatch pawls 46 are selectively connectable, transitorily with the power shaft 4-! by imparting to the actuators 43 downward displacement about their pivotal connections with the arms 4!. The selective connections are effected under control of a set of alphabet and digit keys respectively numbered 50 and 5|. Said keys are 'on levers '49 which are pivoted to the rear of the power shaft '41 in a slotted-bar 52, and which have each, pivotally carried thereon, as at '54, in upreaching relation a link 53 having a hook-end normally posed over a lateral protuberance 550f the actuator 43. The links 53 have capacity for some rearward displacement about said pivots 54 against the tension of light springs 56, the normal position of each link with respect to its associated key lever 49 being established by contact therebetween, as at 51. Near their front ends the key levers 49 are vertically guided in slots of a comb plate Ell. Springs at the rear urge the levers 49 upwardly to their normal positions seen in Figure 1.

It will thus be seen that by selective operation of the keys 49 a desired actuator 43 will be drawn down for association of its snatch pawl 46 with the power shaft 47, and that consequently such actuator will become power operated forwardly and will through rolling action of the arm 4! on the lever 31 operate the appropriate type action.

Normally the segment 20 and the arcuate bar 34 are located in a lower case position, as shown in Figure 1, so that the lower case type (the type nearer the type bar pivot) will swing to the printing point l9. A case shift mechanism, not shown, is provided to give, when desired, the segment 20 and the bell crank supporting bar 34 a lower position wherein the upper case types will swing to the typewriting point H1. The segment 20 and the arcuate bar 34 constitute a unitary movable case shift structure and to this end the arcuate bar at each side of the type bar system has a rearward reach as at 63, see Figure l, and affords a flange 64 at each side of the segment to secure the latter thereto, as by screws 65, see Figures 1, 2 and 3. Said case shiftable structure is guided for case shift movement substantially in the plane in which the group of adding machine printing members l8 lie. The direction of case shift is indicated in Figure 1, by the showing of a ball and raceway at 66. It is to be understood that the points of connection of the links 38 with the rolling levers 31 and the bell cranks 32 are located to provide for similar type bar actuation while typing in either type case.

The snatch pawls 46 are disconnected from the power roll at desired points in each operating stroke. This is accomplished under control of abutments on a bar 61, which are encountered by cam faces provided on the underside of the actuators 43 just in front of the snatch pawls.

The described typing mechanism differs from the one disclosed in the patent to Yaeger, No. 2,254,764 only by the inter-positioning of the bell cranks 32 and the links 33 between the links 38 and the type bars 11. This change was made in order to have the operating connections for the type bars I! forward of the type bar pivots and thereby to allow the positioning of the segment 20 as closely as possible to the adding machine printing bars [8 and the platen.

The typewriting mechanism just described is 7. supported by a typewriter frame generally designated by the numeral I and comprising two spaced side walls 'II which are rigidly connected by the aforedescribed bars 52 and 52, as well as other bars.

3. Letter feed mechanism for work-sheet supporting carriage Referring to Figure 1, the carriage It has supported thereon a letter feed rack I2. Supported on the typewriter frame I0, in a manner not shown, is an escapement wheel 13 carrying a pinion I4 normally in mesh with said rack I2. The rack I2 has teeth at letter-feed intervals and is releasable from the pinion M- at will for repositioning the carriage. Accordingly, the rack is carried at opposite ends of the carriage, by arms 15 having finger pieces I6 extending upwardly therefrom to swing the rack above the pinion I l. Springs 17 associated with the arms '75 maintain the rack I2 releasably in mesh with the pinion I4. The carriage is constantly urged in letter-feed direction, that is, leftwardly, under the tension of a conventional carriage feed spring generally indicated at l3, see Figure 1A. However, a letter-feed escapement 80 associated with the escapement wheel l3 exercises normal control over the carriage to hold it in whatever letter-feed position it may be positioned. This escapement may be the same as is commonly used in the standard Underwood typewriter and is rockable by operation of each type action to feed the carriage one letter feed step. Namely, each of the bell cranks 32 is adapted to operate an arcuate universal bar 8!, giving the latter a short movement of translation forwardly. The universal bar 8| includes two rearwardly reaching bars 82 which at their rear are supported and articulated upon spaced, upreaching arms 85 of a rocker frame having an axis at 85. A downreaching arm 84 of the rocker frame is operatively communicative with the escapement 89 by means of a link 86. The rocker frame axis 85 case shifts unitarily with the segment 29. The universal bar 8| and its associated parts are spring restored. The curved universal bar 8| is nested closely to the front of the arcuate bar 34 and has one or more guiding pins Bl extending thereinto. From the above it will be seen that each power operation of a type bar I? will be accompanied by a transitory operation of the universal bar 8i and that the carriage consequently will execute a letter-feeding step fol- 4. Computing mechanism and printing means controlled thereby The adding machine printing bars I8 are lightweight in structure and each has along its rear side a row of digit types 99, the uppermost type on each type bar being a 0 type and those below being progressively of higher digits. The printing bars I8 abut each other normally at least down to the point of the lowest type 94, and as a group are contained individually slidable lengthwise between the type guide 2| and the member- 27, as before stated. Each printing bar I8 may be caused to rise differentially under control of an adding machine mechanism which in its major respects is identical with the conventionally marketed Sundstrand Class C accounting machine, disclosed in the above mentioned Patent No. 2,194,270. Specifically, the machine comprises for each of the adding machine printing bars IS a differential actuator 95, all

of which are guided for vertical movement in a usual manner, at the top by a bar 96, and at a lower level by a bar 91, these bars being notched to space the actuators laterally. The bars 96 and 91 extend between and are carried fast on two usual spaced frame members 92 of the adding machine framework, see Figures 1, 2, 9 and others. The printing bars [8 are of reduced thickness below the types 94 to intersperse them with the differential actuators 95, each printing bar having its associated actuator closely to the right thereof. Motion is transmitted from each differential actuator 95 to its associated printing bar by motion multiplying means, preferably comprising a relatively large gear 98 in mesh with a gear-rack I99 on the lower end of the printing bar l8, and a smaller gear or pinion iGI in mesh with a rack I92 formed on the differential actuator 95, the two gears being united for rotation together. The several pairs of gears 98 and I9] are turnably supported in a row on a fixed supporting rod 99 as shown n Figure 2. The differential actuators are structurally very similar to those shown in Sundstrand Patent No. 2,194,270 but are ending just above the supporting bar 99, whereabove in said patent they carry digit types that are individually hammer actuatable thereon. Due to the provision of the gears 98 and ID! the movements of the printing bars It are enlarged with respect to the movements of the differential actuators 95, for which reason the types 9Q can be spaced widely enough along the bars to give always clear, individual typing impressions when moved rearwardly, into printing engagement with the platen. On the other hand, the type selecting differential movements of the bars 95 are relatively small, making it feasible to build an adding machine mechanism of relatively small proportions. The various actuators 95 have each an individual lifting lever I94 associated therewith by a pin and slot connection, as shown, each lifting lever I04 being under constant tension of a lifting spring I05. In the normal condition of the machine, however, a universal bar I96 overlies these levers IM so that the actuators 95 and the printing bars I8 are positioned lowermost as seen in Figure 1. During each machine cycle the universal bar I96 rises and the springs Hi5 associated with the levers I9 5 will cause the actuators 95 and their associated printing bars to rise differentially, as called for by a particular item entry or by a total printing operation, the mechanism employed for this being in many regards the same as in said Patent No. 2,194,270.

An amount indexing mechanism, generally designated by the numeral [87, see Figure 1, controls the differential rise of the actuators 95 for item entries. This indexing mechanism includes a conventional bed of stops, comprising a plurality of adjacent vertical rows of stop pins I03, each vertical row containing 10 pins, representative, beginning from the bottom upwardly, the digit values from 0 to 9, and there being as many adjacent rows of pins as actuators 95.

At the rear of the bed of pins I98 there are arranged in a transversely movable carriage III a series of adjacent tail pins II2 which are slidable in vertical perforations therein. Normally said carriage is located so that the rightmost pin IE2 is a short space to the left of the bed of pins I98. Each tail pin H2 has extending through a perforation at the bottom thereof a forward extension N3 of one of the actuators 95, the various extensions II3 having hinged association as at I I4 with their related actuators. The tail pin carriage III constitutes .a denomination shifting carriage :and is slidably supported on a transverse rod H5 in the machine.

Progressively beginning with the leftmost row, index pins I08 are set in accordance with the digit value to be represented. For this purpose there is articulated with the denominational carriage III, as at II'I, the rear end of an arm H8 that is fulcrumed on a vertical pin I to swing horizontally. The arm II8 carries an upright post I I9 near the rear end thereof, wherethrough there extends a vertical row of push rods I 2I for setting the index pins I08. These rods are adapted to swing with the arm I I8 progressively into operative alignment with the several rows of index pins I98. Before commencing to index an amount in the bed of pins I08, the push rods I21 are directly in front of the leftmost row of index pins I08. In a manner to be explained later, the push rods I2I are selectively operated to index one index pin first in the leftmost row. Thereupon the denominational carriage III moves rightwardly one step to place the rightmost vertical tail pin H2 in alignment with the first row of pins I83. Another selective operation of the push rods It! may then be effected, and being that the push rods I2I are then in alignment with the second row of pins MS, a pin will consequently be set in this row. There follows another denominational shift of the carriage I I I, as before, and the indexing operations may be repeated as required by the amount to be indexed. After the desired value has been indexed, the appropriate sensing pins II2 will have become positioned underneath the appropriate rows of set index pins I08, ready in a cycle to limit the upward movement of the actuators 95 and associated printing bars in accordance with the value represented by the set pins.

Referring to Figure 1, the push rods I2I have pivotal connections, as at 125, with arms I23. The latter are all alike and are carried for individual horizontal swinging movement on a vertical stud I24 to actuate the rods I2I rearwardly. All said pivotal connections I25 lie substantially in a vertical line directly in line with the fulcrum pin I 2!} of the swinging arm H8. It follows, therefore, that the push rods I2I swing with the arm I13 and are operable by the arms 1 I23 to index a pin IE8 or" whatever vertical row may be opposite it. The arms I23 are spring restored in a manner well known, to positions wherein the rear ends of the push rods I2I are clear of the bed of index pins IIl8, as shown in Figure l.

A novel mechanism is provided to power actuate the push rod actuating arms I23 under control of the same digit keys 5I by which the numeral typewriting actions are called into operation. Referring to Figures 1, l1 and 12, the lovers 3!; which have the digit keys 5i, carry each pivotally attached thereto a pendant element I27. Whenever the keys iii are operated for typewriting numerals, said pendant elements I21 vibrate idly down and up with their associated key levers 39.

From Figure 1 it will be seen that in front of said pendant elements I23 there lie forwardly reaching levers I28 which at their front ends each carry pivot-ally a snatch pawl I33. The latter are normally below and clear of a toothed power roll I3I which, while the machine is in use, is constantly power rotated in the direction of the arrow. The said levers I23, see Figures 1 and 4, are supported upon pivot pins I29 provided on short arms I 32 that are mounted and upreaching for forward swinging movement upon the lugs I33 on a stationary rod I34 in the machine. Whenever the keys 5i are to be operative for amount indexing operation, the draw links 53 for connecting the type action actuators 33 must be rendered inoperative and, conversely the pendant el ments I2! must be brought into cooperative alignment with the rear ends of the lovers I28.

To this end a unitarily pivoted structure is provided, which includes spaced side members I35 pivotally carried on studs I 33 provided on the opposite side walls II of the typewriter, and which includes further an upper bar I 36 and a lower bar I3? rigidly connecting said side members I33. When the digit keys 5| are to be operative for typewriting. the structure I35, I36, I3! is in the pivotal position seen in Figure 1. By means to be described later, the said pivoted structure is swung to the position seen in Figure 12 whenever it is required that the keys 5| be operative for amount indexing function in connection with the adding machine mechanism.

Observing from Figure 1, it will be seen that the pull links 53, by reason of the forward position of the rod I56, are normally in operative relation with regard to the typewriter actuators I3, and that the pendant elements I27, by reason of the position of the rod I32, are normally lying to the rear of the actuator levers I28, the springs I33 urging the pendant elements I2! to lean resiliently rearwardly against the rod I31.

In the position of the pivotal structure I35, I36, I3l shown in Figure 12, the rod I36 has displaced the pull links 53 rearwardly for incapacitation thereof about the pivot 5-4, while the rod I37 has swung all the pendant elements I21 into operative relation over the rear ends of the levers I28. Therefore when the digit keys 5| are selectively operated while the structure I35, I38, I3! is set as seen in Figure 12, the pendant elements IE? will rock the levers I28 selectively to engage the appropriate snatch pawls I3B with the toothed shaft I3I, the rocked lever I28 consequently receiving bodily a power motion rearwardly, and the arms I32 being rearwardly swinging during such motion.

Operating trains lead from the pivot pin I29 on each arm I32 to the appropriate push rod operating arms I23 of the indexing mechanism.

These trains, see Figure 4, include identical links I42 articulated to the pins I29 and extending downwardly therefrom. With the exception of the two most centrally located links I42 in the machine, all these links are connected to bails I43 that are rockable on a stationary rod I 44 and embody upreaching arms I45 individually associated with the various push rod operating arms I23. The bails I43 are variously shaped, as shown, reaching from their points of connection with the links I I: inwardly from opposite sides to provide the upreaching arms I 45 in a cluster in front of the arms I23. All the bails include a forwardly reaching arm I46 to which one of the links I42 is connected. From the two middle links the motion to their associated push rod operating arms I23 is transmitted by two simple bell cranks, each including, as the said bails, an upreaching arm I45 and a forwardly reaching arm I46. All the arms I45 have an operating nose I l? directly in front of the appropriate arm I23, said noses being ar ranged relative to the various arms I 23 at various arm lengths, preferably in an echelon arrangement as shown in Figure 4, in order that equal angular motion received by the various arms I45 will result in equal angular motions of the push rod operating arms I23. Some of the balls have intermediate web portions I50. This is to provide that the lateral order of the upreaching arms I45 is the same as the lateral order of the related links H32, and thereby to make possible said echelon arrangement of the noses Id'I.

The bail supporting rod Idli is carried on lugs II that project rigidly from a stationary cross bar I52 in the machine. Two of these lugs flank the cluster or array of upreaching arms I45 and, in conjunction with spacing washers between the various upreaching arms M5, determine the lateral positions of the latter, and, therefore, the bails I43.

The actuator levers I28 rest normally near their forward ends upon a stationary angularly shaped cross bar I56. This is under the urge of springs I51 which are anchored to the bar I56 and draw the levers I28 downwardly and forwardly. The normal positions of the actuator levers 528 may be indirectly determined through engagement of the bail and bell crank structures embodying the arms I45, with the lower front side of the bar As each of the actuator levers 528 is driven rearwardly by the power shaft ISI, and as con sequently, the index pins in the various tiers become set, each actuated actuator lever I28, by coaction of a cam face It!) thereon with an abutment screw I6I, cams such actuator downwardly to separate its snatch pawl It'd from the power shaft I3I. The abutment screws ifil are adjustably carried on a transverse bar let fastened upon the adding machine framework.

Each actuator lever I28 is preferably operated only once for each actuation of its associated digit key 5I. To this end, see Figures 1 and 4, the rearward ends of the actuator levers I28 may have each a laterally projecting lug I53 for engagement by the related pendant member I2'i, each engaged lug I53 riding off the rear of the pendant members I21 as each lever I23 is being actuated. Subsequently during the return of the actuated lever I28, the pendant member 521, if remaining operated, is idly displaced about its pivotal connection on the key lever ii! by said lug I63, wherefore the pendant member I21 can reassume its potentially effective position over said lug I53 only after a restoration of the digit key. The snatch pawl Idil' has capacity for some limited pivotal motion on the actuator I28 to the end of assuring a full engagement with the power shaft I3I.

A structure, which in the standard Sundstrand machine hereinabove noted houses a group of digit keys, is retained in the present composite machine, although these keys are replaced by the keys 5|. This is for the support of some old as well as new mechanism. Referring to Figures 1 and 4, this housing structure comprises a base plate I65 fastened as at ifi5, Figure 1, to the base frame It? of the adding machine. It further comprises two spaced side walls I58, N59. The bars I34, I52, I55 are preferably carried by these side walls B68, 569. The bottom panel I54 has clearance perforations for some of the links M2 and some of the up-reaching arms M5.

Upon each successive indexing operation effected under control of a key 5!, the denominational carriage ill, see Figure l, executes a denomination shifting step to the right as seen from the front of the machine. Referring to Fig-- ures 1 and 4, this is done under control of the push rod actuating arms I23 in a usual manner, through operation of a universal bar I'i'i that is pivoted coaxially with the arms I23 and which has connection by means of a link IlZ with a usual escapement device I73, the denominational shifting carriage III being urged to feed rightwardly under power of a spring, not shown.

A usual device, not shown, is provided at the left of the index pin bed to restrict the rise of all actuators of insignificant order to rise only to 0 position. This device, as is conventional in said Sundstrand machine, is incapacitated during total printing operations, when it is desired that all actuators 95 be allowed to rise in accordance with the amounts to be total printed.

5. Crossfooter and operating means therefor capable of addition and subtraction, is arranged between the racks 25 I and 2 I2, and is adapted to be shifted horizontally into mesh with either the adding or subtracting racks, in the same manner as in said patent to Sundstrand No. 2,194,270.

The crossfooter 2I3 comprises a series of individual pinions 2m rotatively mounted upon a transverse shaft 2I5 that is shiftable rearwardly or forwardly to mesh the pinions 2M respectively with the adding racks 2H or the subtracting racks ZIZ. The racks ZII and 2H2 are attached to the rearward actuator branches 2 It by means of mounting studs ZIS on said branches which reach through short vertical slots 2i! in said racks. At the level of the crossfooter, in a usual manner, the racks 2! I and '2I2 are guided in vertical slots provided on transverse bars 2 i8. Contractile springs 226 associated with the racks, and anchored to downward reaches of the actuator branches 2 I U, facilitated by the slots 2 ll, permit, by means to be described, the arrest of the racks 2II, 2I2, during their downward movement at the end of any machine cycle, one unit movement before the actuators S5. However, whenever a register wheel 2M is to receive a transfer movement, the rack 2 or 2i2 in mesh therewith is allowed to move with its associated actuator 95 the full distance, that is one unit movement in excess of the digit value to be printed, it being understood that the total return movement of the differential actuators 95 is always the equivalent of one unit movement in excess of an indexed digit or a digit to be total printed.

. During an item entry cycle in which are crossfooter 2I3 is active, the crossfooter is shifted, forwardly or rearwardly as required, at the beginning of the second half cycle of the machine, to cause the racks M I, 2I2 during their subsequent descent to drive the crossfooter 213 either additively or subtractively. The means by which the racks 2H, 2i2 are arrestable after a decent corresponding to the indexed number comprise pawls 22I engageable by lugs ZIQ on the racks. Whenever a register wheel 2 I i is to receive a units transfer from the wheel of the next lower order, a units transfer tooth 222 on such lower order wheel will trip a transfer control element 223 free from an edge of the bar 2 it where it is normally held. These elements are pivotally carried on the pawls 22L and springs 22d keep them normally latched. Upon the freeing of any element 223, it will, under the tension of a spring 224, move the associated pawl 22I out of blocking 

